Silent success when languageOptions.sourceType is incorrectly defined

[DamienCassou]

I'm migrating my eslint plugin to v9 and forgot to set languageOptions.sourceType to "commonjs" so the default value was "module". Running eslint on my rules would produce 0 warnings or errors because getRuleExportsESM() (from util.js) returns an empty object so getRuleInfo() returns null and no-missing-message-ids.js (for example) has this code:

const ruleInfo = utils.getRuleInfo(sourceCode);
if (!ruleInfo) {
  return {};
}

Would it be possible to get warnings/errors in such cases?

[aladdin-add]

forgot to set languageOptions.sourceType to "commonjs" so the default value was "module".

in such cases, the rule no-undef could report an error when using require/module - they can only be used in cjs.

[DamienCassou]

Thank you 👍